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Fair Value Measurements (Fair Value Measurements within the Fair Value Hierarchy of the Financial Assets) (Details) (USD $)
In Thousands, unless otherwise specified
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May 31, 2014
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Nov. 30, 2013
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Contingent consideration [Member] | Total Fair Value [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial liabilities |
$ (1,649) |
$ (388) |
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Contingent consideration [Member] | Level 1 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial liabilities |
0 |
0 |
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Contingent consideration [Member] | Level 2 [Member]
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|
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial liabilities |
0 |
0 |
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Contingent consideration [Member] | Level 3 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial liabilities |
(1,649) |
(388) |
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Money market funds [Member] | Total Fair Value [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
74,692 |
54,513 |
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Money market funds [Member] | Level 1 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
74,692 |
54,513 |
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Money market funds [Member] | Level 2 [Member]
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|
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
0 |
0 |
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Money market funds [Member] | Level 3 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
0 |
0 |
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State and municipal bond obligations [Member] | Total Fair Value [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
24,605 |
31,102 |
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State and municipal bond obligations [Member] | Level 1 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
0 |
0 |
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State and municipal bond obligations [Member] | Level 2 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
24,605 |
31,102 |
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State and municipal bond obligations [Member] | Level 3 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
0 |
0 |
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Auction rate securities - municipal bonds [Member] | Total Fair Value [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
22,187 |
23,453 |
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Auction rate securities - municipal bonds [Member] | Level 1 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
0 |
0 |
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Auction rate securities - municipal bonds [Member] | Level 2 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
0 |
1,520 |
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Auction rate securities - municipal bonds [Member] | Level 3 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
22,187 |
21,933 |
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Auction rate securities - student loans [Member] | Total Fair Value [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
2,869 |
2,828 |
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Auction rate securities - student loans [Member] | Level 1 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
0 |
0 |
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Auction rate securities - student loans [Member] | Level 2 [Member]
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|
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
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| Fair value of financial assets |
0 |
0 |
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Auction rate securities - student loans [Member] | Level 3 [Member]
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|
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
2,869 |
2,828 |
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Corporate bonds [Member] | Total Fair Value [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
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171 |
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Corporate bonds [Member] | Level 1 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
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0 |
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Corporate bonds [Member] | Level 2 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
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171 |
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Corporate bonds [Member] | Level 3 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
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0 |
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Foreign exchange contract [Member] | Total Fair Value [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
(152) |
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Foreign exchange contract [Member] | Level 1 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
0 |
|
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Foreign exchange contract [Member] | Level 2 [Member]
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|
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
|
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| Fair value of financial assets |
(152) |
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Foreign exchange contract [Member] | Level 3 [Member]
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Fair value of financial assets |
$ 0 |
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